Demmick is a cursed human character who bears the form of a large anthropomorphic rat. Cursed by Vecna at a young age due to a godly conflict between Pelor and Vecna, his physical form slowly changed over a course of weeks to resemble the form it takes today.

Demmick's spirit was hand-selected by Pelor to become a bastion of his will, thrusting him out of The Shadowfell and onto the mortal plane once more. Vecna's interest in Demmick's spirit caused a godly feud between Pelor and himself, ending in the curse placed upon Demmick's mortal figure.

Demmick is a Lawful Neutral Avenging Paladin in service to Pelor, god of sun and summer. He wields a hammer and shield and wears a Symbol of Battle with Pelor's symbol engraved upon it around his neck. Traveling with him is a normal sized rat named Jeffery, who is Demmick's oldest friend and companion. Demmick is also sporting the Eye of Vecna which was aquired through Jeffery's help. (See: Eye of Vecna (Duel of Fates) )